Yokoyama

Yokoyama Seisakusho (横山製作所) was a Japanese company based in Shiba, Tokyo (today Minato),[1] c.1939, and about which little is known. The company offered a flash synchronization device for large format roller-blind shutters, featured in the January 1939 issue of Asahi Camera. The customer had to turn in his/her own shutter for the modification, which cost ¥5. The special 15-inch synchro cord was sold for ¥1.9, and further 15-foot extension cords were available for ¥1.60.